Supporting industry is an integral part of any manufacturing value chain, particularly so in the current globalized world where improvements in technology and logistics have made it more cost-effective for firms to be focusing only on activities they have comparative advantage in, and outsource the rest. This synthesis report brings together the policy experiences of three APEC economies (Australia, Mexico; and Viet Nam) in promoting competitive, highly-skilled and modern supporting industries. It looks at the motivations and policies for developing their supporting industries, and distills some key takeaways and what can be done to improve the quality of policies for promoting supporting industry among APEC economies.